package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void add(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();

        // 设置属性
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        // 只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        //判断当前商品是否在购物车中
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

        //根据dishId  setmealId dishFlavor userid 来查，实质上，每次都只能查到一个商品
        if(shoppingCartList != null && shoppingCartList.size() == 1){
            //如果已经存在，就更新数量，数量加1

            //取出购物车的这个商品
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);

            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            //如果商品不存在，则插入数据，并且设置数量为1

            //判断当前添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){
                //添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                //添加到购物车的是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }

            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    /**
     * 查看购物车列表
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     * @return
     */
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        //这只能查到一个商品
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if(list != null && list.size() > 0) {
            //取出集合的第一个商品，实质集合也就只有一个商品
            shoppingCart = list.get(0);
            //判断商品数量是否大于1
            if (shoppingCart.getNumber() > 1) {
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            } else {
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }
        }

    }


}
